1. A group of individuals of the same species living in a particular area
Populations
A group of individuals of the same species living in a particular area

2. Characteristics of Populations
Size
Density
Dispersion

3. Population Density
Number of individuals per unit area (land) or volume (water)

4. Population Dispersion
The relative distribution or arrangement of its individuals within a given amount of space
Clumped resources
Social congregation
Mating
Territorial
Solitary lifestyle

5. ) Growth Rate ( ( ) = + - + Births Deaths Growth Rate Emigration
Immigration
Deaths
Emigration = + - +

6. Exponential Growth Constant growth of a population J shaped curve
Birth rate exceeds the death rate
J shaped curve

7. Conditions for Exponential Growth
Unlimited resources
Abundant space
Abundant food
Shelter
Decrease in predators
Decrease in disease
Reproduction

8. Human Population
Link in pic

9. Reasons for Human Population Growth
Agriculture
Industry
Improved sanitation
Medicine

10. Future Human Growth Current Human population 2025 2050 7.8 Billion

11. Logistic Growth
Growth of a population slows or stops as resources become less available
S curve

12. Carrying Capacity
The largest number of individuals that a given environment can support at a given time

13. Stable Population
Carrying Capacity (K)
Expontential
Rapid Growth
Slow Growth

14. Factors that cause population growth to decrease
Limiting Factor
Factors that cause population growth to decrease

15. Density-Dependent Factors
A limiting factor that
depends on population size
Factors:
Predation
Competition
Parasitism
Disease

16. Density Independent Factors
Affect all populations regardless of size
Examples
Weather
Natural disasters
Human activities

17. Species that have a critical role and effect on an ecosystem
Keystone Species
Species that have a critical role and effect on an ecosystem
Examples:
Wolves
Sharks

18. Human Impacts on Populations